PRW Pushrod Guide Plates are heat-treated steel alloy and a must have for todayfs high performance engines. Guide plates reduce unwanted sideways motion of the pushrod under load. This keeps the rocker arm stabilized, making the valve operation much smoother and more efficient. PRW Guide Plates maintain correct alignment and proper valvetrain operation without breakage under high loads and high RPM. These guide plates are designed to work with chromoly racing pushrods or high performance pushrods (not for use with stock pushrods). Each guide plate is heat-treated to help prevent premature wear, specially tumbled for a smoother finish and black oxide coated to resist corrosion.